Have you ever read "Journey to the Center of the Earth" and wondered if it were possible to do it? Well, scientists are in the process of giving it their best shot. How hard is it to dig a hole this deep, and what might they find?

Of course you know what gravity is. It's the force behind Wile E. Coyote plummeting off the face of a cliff and you stumbling spastically in front of your crush. But did you know it can bend light and help us detect hidden cosmic phenomena, too?

Water surrounds us, falling from the sky, rushing down Niagara Falls, pouring from faucets, and yet many of us never ask where it comes from. The answer stretches way back -- before tides and thunderclouds to the big bang.

What if we could just add water to something and solve the planet's energy crisis? That's essentially the idea behind artificial geothermal energy. But there's one possible catch: catastrophic earthquakes.

Geysers are beautiful and their eruptions are exciting, but these fragile natural wonders are not to be trifled with. The water shooting from the geyser -- and the eruptions themselves -- can cause serious damage.

If you go to the beach, you can spend hours watching the waterline rise and fall as the day wears on. There are two of these tides each day, but what causes tides and why are there two of them each day? Find out in this article.